Nishimachi International School vs St. Mary's International School
🇯🇵 Tokyo · Side-by-side comparison on verifiable public data.
Neither Nishimachi International School nor St. Mary's International School sits in a market with a public inspectorate, so both are assessed on verifiable accreditation, curriculum authorisation, and published data rather than an official quality rating. Curriculum is the core differentiator: Nishimachi International School offers American, Japanese, Blended while St. Mary's International School offers IB, American — the choice should follow the family's target qualification system. Both are day schools with fees in the same market band — see the table below for the figures, and verify against each school's own published fees.
Key Facts
| Nishimachi International School | St. Mary's International School | |
|---|---|---|
| Curriculum | American / Japanese / Blended | IB / American |
| Ages | 5–15 | 5–18 |
| Languages of instruction | English, Japanese | English |
| Annual fees | JPY 3,129,000 | JPY 3,060,000–3,250,000 |
| Enrollment | 468 | 1,000 |
| Boarding | Day only | Day only |
| Accreditations | WASC, CIS | CIS, WASC |
Strengths
- ✓Genuine dual accreditation (WASC + CIS) — strong for a school with no public inspectorate available
- ✓Deep, leveled English–Japanese bilingual programme — Japanese is a core academic strand, not a token language class
- ✓Long heritage (since 1949) and small scale (468 students, 1:7 ratio, ~20/class) supporting individual attention
- ✓Central Tokyo (Moto-Azabu) location with a strong community reputation
- ✓Full fee transparency published for the upcoming school year
- ✓Dual CIS + WASC accreditation — exceptional accreditation depth for a Japan-based school
- ✓Full K–12 continuity (ages ~5–18) on a single 9-acre campus, with IB DP capstone
- ✓70-year-old established institution with a clear, stable Catholic mission
- ✓Strongly international student body (~1,000 boys, ~60 nationalities)
- ✓Published, transparent IB DP subject offering (all six groups + TOK/CAS/EE)
Trade-offs
- !Ends at Grade 9 — no high school; families must arrange a separate high-school transition (Tokyo or overseas)
- !No IB or Cambridge programme offered (no published authorisation)
- !No published EAL/ESL (English-support) programme on public pages — may challenge non-native-English entrants, especially at older grades
- !Small size means narrower extracurricular/specialist breadth than larger K–12 campuses
- !No published university-placement data (structurally — the school is K–9)
- !No published academic outcomes — IB average, pass rate and university destinations all not public
- !EAL/ESL support is not described anywhere public; English-language-learner provision is unverifiable
- !AP is sometimes assumed but is NOT publicly evidenced — only the IB DP is confirmed
- !Official tuition figures could not be confirmed on the school's own fees page (third-party only)
- !The school's Wikipedia entry references 2014 historical abuse allegations — a matter of public record families may wish to research independently
Best Fit For
- • Families prioritising authentic English–Japanese bilingualism in the early/elementary/middle years
- • Families based long-term in central Tokyo seeking a small, community-oriented school
- • Children who will continue to a separate high school (international in Tokyo or abroad)
- • Parents valuing recognised international accreditation (WASC/CIS)
- • Families specifically seeking a single-sex, all-boys environment
- • Families wanting a Catholic / faith-based education within an international setting
- • Families prioritising accreditation rigour (CIS + WASC) as a quality signal
- • Long-stay expat or local families wanting K–12 continuity in one institution
University Placement
School-reported · not independently verified
School-reported, unverified: the homepage cites '100% of graduates complete higher education.' Treat as a school-reported marketing claim — structurally limited because Nishimachi ends at Grade 9 (graduates proceed to separate high schools before any university placement).
Not public. No university destinations, placement statistics, or matriculation lists are published, though the school maintains a University Counseling function.
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Frequently Asked Questions
Should I choose Nishimachi International School or St. Mary's International School?
Nishimachi International School is best for: Families prioritising authentic English–Japanese bilingualism in the early/elementary/middle years. St. Mary's International School is best for: Families specifically seeking a single-sex, all-boys environment. The right choice depends on target curriculum, budget, and family priorities — the two are not linearly comparable.
How do fees compare between Nishimachi International School and St. Mary's International School?
Nishimachi International School: JPY 3,129,000. St. Mary's International School: JPY 3,060,000–3,250,000. Verify against each school's own published fees; some figures are sourced from third-party aggregators.
What curricula do Nishimachi International School and St. Mary's International School offer?
Nishimachi International School: American, Japanese, Blended. St. Mary's International School: IB, American.
Do Nishimachi International School or St. Mary's International School offer boarding?
Nishimachi International School: day school only. St. Mary's International School: day school only.
This comparison is BrightKey's independent assessment using verifiable public data only. University-placement figures are school-reported and not independently verified. BrightKey takes no payments from schools. Our method →